Project Overview
Location
Zhengzhou, Henan, China
Capacity
20,000 L/h (20 m³/h Final Output, Pre-treatment >40 m³/h)
Water Quality
Conductivity≤10μS/cm(25℃），Hardness≤0.03mmol/L
System type:
Multi-Media Pretreatment + Double-Stage RO + Variable Frequency Supply
The Challenge
A large-scale industrial manufacturing and processing facility in Zhengzhou, Henan, required a high-capacity, dependable water purification system to feed continuous industrial cooling loops and supply premium-grade plant water.
- Strict Dual Standards: The facility needed to simultaneously meet national pure water standards (conductivity ≤10μS/cm) and softened water specifications (hardness≤0.03mmol/L) to prevent scaling in heat exchangers and process equipment.
- High-Volume Continuous Demand:Operating complex manufacturing linesrequired a robust design with adequate safety margins-featuring a pre-treatmentcapacity of > 40 m³/h, a first-pass RO output of > 25 m³/h, and a stablesecondary RO delivery of > 20 m³/h .
- Energy & Operational Efficiency:The entire system needed to operate within strictpower constraints (total installed power 55 kW under a 3-phase 5-wire380V/220V power supply) while maintaining automated, trouble-free operation.
Our Custom Engineering Solution
Based on standard municipal or underground raw water sources, we engineered a fully integrated, automated double-stage reverse osmosis purification and constant-pressure supply line:
Pre-treatment & Filtration Stage
Incorporates an auto-filling raw water buffer tank, raw water booster pumps, multi-media sand filters, activated carbon filters, precision antiscalant dosing, and security fine filtration to thoroughly remove suspended solids, chlorine, and foulants.
Double-Stage RO Purification Core
Double-Stage RO Purification Core: Utilizes a stepped high-efficiency configuration(first-pass > 25 m³/h and second-pass > 20 m³ /h ) achieving a system desalinationrate of > 99% and overall recovery of > 65%
Post-Treatment & Constant Pressure Supply
Treated pure water is collected in a storage tank, sterilized via UV disinfection, and distributed stably across the plant using an integrated variable frequency constant-pressure water supply unit.
Project Results & Benefits
Following successful installation and commissioning, the 20 m³/h double-stage purification
system achieved stellar operational metrics, maintaining product water conductivity strictly
below 10 μS/cm and hardness under 0.03 mmol/L . The seamless integration of robust
multi-stage pre-treatment, double-pass membrane polishing, and variable frequency supply
guaranteed safe, energy-efficient ( 55 k W max load) continuous water delivery for the
factory’s cooling loops and operational needs.
Technical Specifications
| APPLICABLE WATER SOURCE | Urban tap water, groundwater |
| DESIGN CAPACITY | Pre-treatment ≥40m3/h, 1st-Stage RO ≥25m³/h, 2nd-Stage RO ≥20m³/h |
| PRODUCTION WATER QUALITY | Conductivity≤10μS/cm(25℃），Hardness≤0.03mmol/L |
| Power Supply & Load | 3-Phase 5-Wire, AC 220V/380V/50HZ; Total Installed Power ≤55KW |
| WORKING PRESSURE | Pre processing: 0.2-0.4Mpa, RO host: 0.7-1.8Mpa |
| Technical Indicators | System Recovery Rate ≥65%; Desalination Rate ≥99% |
| Application & Source | Industrial closed-loop cooling & high-grade water; Municipal tap or conventional groundwater |
| Process Flow Line | Raw Water → Auto Inlet Valve → Buffer Tank → Booster Pump → Multi-Media Filter → Activated Carbon Filter → Antiscalant Dosing → Precision Filter → Double-Stage RO Host → Pure Water Tank → UV Sterilizer → VFD Constant-Pressure Supply |